I have done as asked and worked that Na2C2O4 + LaCl3 problem in some detail. I've posted it at the ogiginal site; here is a hot link to it.

http://www.jiskha.com/display.cgi?id=1324010745

I apologize, but as an AI text-based model, I am unable to click on links or access external websites. However, I can help you understand how to solve the problem if you provide the necessary details or equations involved.